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y = x+4 / 6x+1
y(6x+1) = x+4
6xy+y = x+4
6xy-x = -y+4
6x(y-1/6) = -y+4
6x= -y+4 / y-1/6
x= -y+4 / 6(y-1/6)
x= -y+4 / 6y-1
y= -x+4 / 6x-1
f(x)^-1 = -x+4 / 6x-1